The amount of food an alpaca eats depends on a number of factors, including the animal's age, size, activity level, and the quality of the food. Younger alpacas and pregnant or lactating females will need to eat more than older alpacas or males. Alpacas that are more active will also need to eat more than those that are less active. And, of course, alpacas that are fed high-quality food will need to eat less than those that are fed low-quality food.
It is important to provide alpacas with a consistent diet and to avoid sudden changes in the type or quantity of food they are fed. This can help to prevent digestive problems.